Potassium Phosphate, Tribasic → 5-Cyclopropyl-2-fluoropyridine

Temperatur

100 °C

A mixture of 2-fluoro-5-bromopyridine (1.17 ml, 11.4 mmol), cyclopropylboronic acid (1.47 g, 17.1 mmol) and potassium phosphate (7.26 g, 34.2 mmol) in 1,4-dioxane (20 ml) was stirred under argon atmosphere. Chloro(di-2-norbornylphosphino)(2-dimethylaminoferrocen-1-yl)palladium(II) (67 mg, 0.11 mmol) was added. The reaction mixture was heated at 100° C. under argon atmosphere for 48 hours and then cooled down to room temperature. The crude mixture was partitioned between ethyl acetate and water. The organic phase was washed with brine, dried over magnesium sulfate, filtered and concentrated in vacuo. The residue was purified on silica gel by flash column chromatography (ISCO Companion|, 80 g column, 0-10% EtOAc/Petroleum ether) to afford the compound (70:30 mixture product:starting material; 1.55 g).

1. temperaturecooled down to room temperature
2. customThe crude mixture was partitioned between ethyl acetate and water
3. washThe organic phase was washed with brine
4. dry with materialdried over magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customThe residue was purified on silica gel by flash column chromatography (ISCO Companion|, 80 g column, 0-10% EtOAc/Petroleum ether)
8. customto afford the compound (70:30 mixture product:starting material; 1.55 g)

ORD-Eintrag

ord-085a84f4b6d2487891d7362e7db87c96

Quelldatensatz

uspto-grants-2014_06

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US08741931B2